Fe is the basis. According to TU 14-3-1573-96 carbon equivalent of Se ≤ 0.43%. It is allowed to introduce into the steel a technological additive silicocalcium or rare-earth materials (REM) at the rate of 0.5-2.0 kg per 1 ton of steel. For 20% of smelting, the mass fraction of manganese is allowed up to 1.80%. According to TU 14-158-146-2004 the chemical composition is given for the ladle sample for the 1st level of the quality of the pipes. For pipes of the 2nd level of quality in the ladle sample, the mass fraction of sulfur is ≤ 0.010%, phosphorus ≤ 0.015%, nitrogen ≤ 0.010%. Vanadium is optional and is introduced into steel by calculation with the manufacturer's agreement with the consumer.